Aeroplane



244. AtriuNAu l we F. C. LAWRENCE.

AEROPLANE.

APPLICATION FILED JULY 23. I919.

Patented Sept. 7, 1920.

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VAPPUCATION FILED JULY 23. I9l9. 1,351,918. PatentedSept. 7, 1920.

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AEROPLA'NE.

Application filed July 23,

To all whom it may concern:

Be it known that I, F REDRIOK C. LAW- RENCE, a citizen of the UnitedStates, and a resident of the borough of Manhattan, city and State ofNew York, have invented certain new and useful Improvements inAeroplanes, of which the following is a specification.

This invention relates to air craft more particularly to aeroplanes.

One of the objects is to provide an aeroplane which shall be readilyadjustable to secure efficient flight under varying conditions.

Another object is to provide apparatus of the above type, which shall bestrong and reliable in construction, while permitting adjustment inflight to secure efficiency of operation, for various conditions offlight.

Other objects will be in part obvious and in part pointed outhereinafter.

The invention accordingly consists in the features of construction,combinations of elements and arrangement of parts which will beexemplified in the construction hereinafter set forth, and the scope ofthe application of which will appear in the following claims.

Referring now to the accompanying drawings, wherein is shown one ofvarious possible embodiments of the several features of my invention,

Figure 1 shows a side elevation of an aeroplane partly in section.

Fig. 2 shows a rear elevation thereof with my invention indicatedthereon, parts being broken away.

F 1'2: 3 shows a sectional view taken along Specification of LettersPatent.

Patented Sept. '7, 1920.

1919. Serial No. 312,698.

sired construtcion. The usual ailerons for effecting banking of themachine in turning, are indicated at 9.

The upper wing construction is shown more or less conventionally, asincluding a main or front spar 10, a rear spar 11, and rib members 53connecting the front and rear spar to furnish a frame work for thefabric covering 54. The lower wings are generally similar to the upper,similar parts being designated by the same reference numerals primed. Aplurality of struts 12 are provided for connecting the main spars of thetwo wings 6 and 7 at spaced intervals, and similar struts 13 areprovided for connecting the rear spars of the two wings. A crossbracingwire 1 1 connects the upper end of each strut to the lower end of thesucceeding strut and a similar wire 15 connects the lower end of eachstrut to the upper end of the succeeding one.

The parts of the aeroplane thus far described, are common to numeroustypes of modern aeroplanes and are not my invention when taken bythemselves.

My invention contemplates arranging the wings 6 and 7 so that the angleof incidence thereof may be adjusted conveniently as desired, either onthe field or during flight. For this purpose, I form a hinged or pivotedconnection between the struts 12 and 13 and the wings to which theirends are attached. as clearly shown at 16, 17, 18 and 19 in Fig. 3. Thedistance between the front and rear spar of the two wings being equal,and the struts 12 and 13 bemg preferably constructed of equal lengths,it follows that any pair of struts 12 and 13 will constitute a

